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A: No. .sav is usually battery-backed SRAM (saves from within the game). .sgs is a full emulator snapshot (includes CPU state, audio, video).
| Offset (hex) | Size (bytes) | Content | |--------------|--------------|---------| | 0x0000 | 4 | Signature ("GS ") – Gens Save State | | 0x0004 | 4 | Version (e.g., 0x00000100) | | 0x0008 | 0x8000 | Z80 CPU state + RAM | | 0x8008 | 0x20000 | 68K CPU state + RAM (main memory) | | 0x28008 | 0x4000 | Video RAM (VRAM) | | 0x2C008 | 0x2000 | Sprite Attribute Table | | 0x2E008 | Variable | YM2612 sound chip state |
| From | To | Tool | |------|----|------| | Gens SGS | Kega Fusion GSX | SGStoGSX.exe | | Gens SGS | RAW memory dump | HxD (extract offsets 0x8008-0x28008) | Q: Can I edit an SGS file on a Mac or Linux? A: Yes, using a hex editor (e.g., Bless, Okteta) or Wine to run Gens Tracer.
A: Yes, but the memory offsets may differ if the ROM is heavily modified. Conclusion Editing an SGS file is primarily a task for retro game hacking enthusiasts. Use Gens Tracer for memory editing or KMod for applying cheat codes. For general modifications, a hex editor works if you understand the Genesis memory layout. Always keep backups, and be aware that checksum-protected games may reject modified states. Would you like a sample Python script to parse the header of an SGS file or extract the 68K RAM section?
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A: No. .sav is usually battery-backed SRAM (saves from within the game). .sgs is a full emulator snapshot (includes CPU state, audio, video).
| Offset (hex) | Size (bytes) | Content | |--------------|--------------|---------| | 0x0000 | 4 | Signature ("GS ") – Gens Save State | | 0x0004 | 4 | Version (e.g., 0x00000100) | | 0x0008 | 0x8000 | Z80 CPU state + RAM | | 0x8008 | 0x20000 | 68K CPU state + RAM (main memory) | | 0x28008 | 0x4000 | Video RAM (VRAM) | | 0x2C008 | 0x2000 | Sprite Attribute Table | | 0x2E008 | Variable | YM2612 sound chip state |
| From | To | Tool | |------|----|------| | Gens SGS | Kega Fusion GSX | SGStoGSX.exe | | Gens SGS | RAW memory dump | HxD (extract offsets 0x8008-0x28008) | Q: Can I edit an SGS file on a Mac or Linux? A: Yes, using a hex editor (e.g., Bless, Okteta) or Wine to run Gens Tracer.
A: Yes, but the memory offsets may differ if the ROM is heavily modified. Conclusion Editing an SGS file is primarily a task for retro game hacking enthusiasts. Use Gens Tracer for memory editing or KMod for applying cheat codes. For general modifications, a hex editor works if you understand the Genesis memory layout. Always keep backups, and be aware that checksum-protected games may reject modified states. Would you like a sample Python script to parse the header of an SGS file or extract the 68K RAM section?
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